The other bit I wondered about were the two asides of William to Kate and her father, and then to Kate. A commenter below: "Lip readers reckon that Will says "We were only supposed to have a small, family affair" to Kate and her father." That got a laugh out of the two.
I wonder what William said to Kate next. It looked like something appropriate about his beautiful bride, but I haven't watched again. Lip readers have that?
UPDATE: The Mirror is on the case. But somebody at NBC hired a forensic lip reader.